Polybutylene (often called "poly" or PB) is a gray, sometimes blue or black, flexible plastic water supply pipe that was widely installed in the U.S. from the late 1970s through the mid-1990s. Many South Florida homes from that era still have it.
Why polybutylene is a concern
Over time, polybutylene can become brittle and crack from the inside, especially at fittings. Failures often happen without warning. Because of its reputation, many insurers and home buyers view it as a risk, and some insurers may decline or surcharge coverage for homes that still have it.
How to tell if you have it
- Look where pipes come out of walls under sinks and at the water heater.
- Polybutylene is usually gray, flexible and stamped "PB2110."
- Fittings may be plastic or metal crimp rings (copper or aluminum bands).
- Check where the main line enters the house; sometimes it's used there even if interior pipe is different.
Don't confuse it with PEX, a modern flexible pipe that's usually white, red or blue and clearly labeled "PEX."
Your options
Replace it proactively. A whole-home repipe with PEX or copper removes the risk, often takes only a few days, and is typically routed through walls and attic rather than under the slab.
Replace it when you sell or buy. Buyers and inspectors frequently flag polybutylene, so replacing it can remove an obstacle to a sale.
Monitor it. If you choose to wait, know where your shut-off is, check exposed fittings periodically and act at the first leak.
A plumber can confirm what you have and give you a written repipe estimate so you can plan on your own timeline instead of the pipe's.
Need help?
Our pipe repair & repiping team serves Davie and all of Broward County. Call (954) 870-5492.